Cornelsen Fokus Physik Lösungen

A package of aluminum foil contains 50. Ft2 of foil, which weighs approximately 7.0 oz . Aluminum has a density of 2.70 g/cm3. W

kumpel [21]

We know density = Mass / Volume

So Volume = Mass/Density

Volume = Area * Thickness

$Area = 50 ft^2 = 4.645152 m^2\\ \\Mass = 7 oz = 0.198447 kg\\ \\Density = 2.70 g/cm^3 = 2700 kg/m^3\\ \\Substituting \\ \\4.645152 *t = \frac{0.198447}{2700} \\ \\t = 1.58*10^{-5}m = 1.58*10^{-2}mm$

So the approximate thickness of the foil in millimeters = $1.58*10^{-2}mm$

6 0

4 years ago

A mass of 5kg accelerates at 3m/s/s, how much force was put on it?

goldfiish [28.3K]

Answer:

15N

Explanation:

According to Newton's Second Law of Motion

F = m*a

mass = m = 5Kg

acceleration = a = 3m/s^2

=> F = 5kg * 3m/s^2

=> F = 15 N

5 0

3 years ago

Read 2 more answers

An object starts from rest and accelerates uniformly in a straight line in the positive x direction. After 11 seconds, its speed

vladimir1956 [14]

Answer:

$v_{avg}=35m/s$

Explanation:

To calculate the average velocity we must know the distance traveled and do $v_{avg}=\frac{d}{t}$ . The distance traveled is $d=\frac{at^2}{2}$ , so we need to calculate the acceleration, which, since it's uniform, is $a=\frac{\Delta v}{\Delta t}=\frac{v_f}{t}$ . Putting all together:

$v_{avg}=\frac{d}{t}=\frac{at^2}{2t}=\frac{at}{2}=\frac{v_ft}{2t}=\frac{v_f}{2}=35m/s$

4 0

3 years ago

What is the shortest possible time in which a bacterium could travel a distance of 8.4 cm across a petri dish at a constant spee

Dahasolnce [82]

speed of the bacterium is 3.5 mm/s

$v = 3.5 mm/s$

total distance traveled by bacterium = 8.4 cm

$d = 8.4 cm = 84 mm$

time take to cover the distance

$t = \frac{d}{v}$

$t = \frac{84}{3.5} = 24 s$

<em>so it will take 24 s to move this distance</em>

7 0

4 years ago

which part of the microscope will be used first to adjust the focus when starting with the lowest power lens?

noname [10]

The first part of the microscope that should first be used to adjust the focus when starting with the lowest power lens would be the coarse adjustment knob.

There are two knobs in a typical light microscope with which objects on slides can be brought into focus:

Coarse adjustment knob
Fine adjustment knob

The 2 knobs are used to adjust the stage to either bring it up towards the objective lens or down away from them. The coarse adjustment knob, however, moves the stage a considerable distance with each turn. The fine adjustment knob, on the other hand, only moves the stage very little with each turn.

The lowest power lenses are often short. Hence, using the coarse adjustment knob is ideal in order to quickly bring objects on slides into focus.

The fine adjustment knob comes highly recommended at high objectives because high objectives lenses are usually long and using the coarse adjustment knob can lead to a breakage of the slide by the lens.

More on bringing objects into focus on a microscope can be found here: brainly.com/question/24319677

7 0

3 years ago